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If FALSE, the output tensor containing indices. If TRUE, one
1-D tensor for each dimension, containing the indices of each nonzero element
along that dimension.
When as_list is FALSE (default):
Returns a tensor containing the indices of all non-zero elements of
input. Each row in the result contains the indices of a non-zero
element in input. The result is sorted lexicographically, with
the last index changing the fastest (C-style).
If input has n dimensions, then the resulting indices tensor
out is of size (z \times n), where z is the total number of
non-zero elements in the input tensor.
When as_list is TRUE:
Returns a tuple of 1-D tensors, one for each dimension in input,
each containing the indices (in that dimension) of all non-zero elements of
input .
If input has n dimensions, then the resulting tuple contains n
tensors of size z, where z is the total number of
non-zero elements in the input tensor.
As a special case, when input has zero dimensions and a nonzero scalar
value, it is treated as a one-dimensional tensor with one element.
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